Преобразование кода из javascript в java

(function mapGen(b, c, e, a, m) { 
    function character(a, b) { 
       // alert(b);  
        var h = d.getImageData(13 * f + 7 + 6 * a, 13 * g + 7 + 6 * b, 1, 1); 
        0 == h.data[0] && 0 == h.data[1] && 0 == h.data[2] && 255 == h.data[3] ? a = b = 0 : document.querySelector("#step").innerHTML = Math.floor(document.querySelector("#step").innerHTML) + 1; 
        d.clearRect(13 * f + 3, 13 * g + 3, 10, 10), f += a, g += b, d.fillRect(3 + 13 * f, 3 + 13 * g, 10, 10); 
        f >= c && mapGen("#canvas", c, e, 0, m + 1)} 
    b = document.querySelector(b); 
  //alert(b); 
    var d = b.getContext("2d"); 
    document.querySelector("#step").innerHTML = Math.floor(a), document.querySelector("#complete").innerHTML = Math.floor(m); 
    b.width = 13 * c + 3, b.height = 13 * e + 3, d.fillStyle = "black", d.fillRect(0, 0, 13 * c + 3, 13 * e + 3), a = Array(c), b = Array(c); 
    var k = Array(c), q = 1; 
    for (cr_l = 0; cr_l < e; cr_l++) { 
        for (i = 0; i < c; i++) 0 == cr_l && (a[i] = 0), d.clearRect(13 * i + 3, 13 * cr_l + 3, 10, 10), k[i] = 0, 1 == b[i] && (b[i] = a[i] = 0), 0 == a[i] && (a[i] = q++); 
        for (i = 0; i < c; i++) { 
            k[i] = Math.floor(2 * Math.random()), b[i] = Math.floor(2 * Math.random()); 
            if ((0 == k[i] || cr_l == e - 1) && i != c - 1 && a[i + 1] != a[i]) { 
                var l = a[i + 1]; 
                for (j = 0; j < c; j++) a[j] == l && (a[j] = a[i]); 
                d.clearRect(13 * i + 3, 13 * cr_l + 3, 15, 10) } 
            cr_l != e - 1 && 0 == b[i] && d.clearRect(13 * i + 3, 13 * cr_l + 3, 10, 15) } 
        for (i = 0; i < c; i++) { 
            var p = l = 0; 
            for (j = 0; j < c; j++) a[i] == a[j] && 0 == b[j] ? p++ : l++; 
            0 == p && (b[i] = 0, d.clearRect(13 * i + 3, 13 * cr_l + 3, 10, 15)) } } 
    d.clearRect(13 * c, 3, 15, 10); 
    var f = 0, g = 0; 
    d.fillStyle = "red", character(-1, -1); 
    document.body.onkeydown = function (a) { 
        36 < a.keyCode && 41 > a.keyCode && character((a.keyCode - 38) % 2, (a.keyCode - 39) % 2)  
    } 
})("#canvas", 25, 30, 0, 0);

<div class="stat">steps: <span id="step">0</span> complete: <span id="complete">0</span></div> 
<canvas id="canvas" style="background:#eeeeee"></canvas>